FIELD: manufacture of springs, possibly for furniture, particularly manufacture of springy mattresses for soft furniture.
SUBSTANCE: method comprises steps of feeding round cross section wire; forming and binding knots on supporting turns due to twisting wire end under predetermined pressure around supporting turn; before forming spring blank, imparting to wire out-off-round cross section or making spring blank from wire having out-off-round cross section. When wire end portion is twisted around supporting turn in contact zone of twisted wire and wire of supporting turn recesses are formed on portions of supporting turn wire having positive deflection from out-off-roundness due to creation of pressure exceeding preset value. Twisted wire is pressed-in to said recesses.
EFFECT: enhanced strength of knots, increased useful time period of spring, operational reliability of articles.
2 cl
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